I have two lines.
I have each X,Y.
I want to find the angle between them (please mark if your method returns radians or degrees)
Aka a function F[x,y,x2,y2,Cx,Cy] that'll return their angle (at crossing point...)
While Cx and Cy are Cross-point X and Y, that means they point where they touch, assuming input is ok. (in the image its the center dot)